US10890671B2 - Time-based signal acquisition apparatus and method using sawtooth-shaped threshold voltage - Google Patents
Time-based signal acquisition apparatus and method using sawtooth-shaped threshold voltage Download PDFInfo
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- US10890671B2 US10890671B2 US15/954,733 US201815954733A US10890671B2 US 10890671 B2 US10890671 B2 US 10890671B2 US 201815954733 A US201815954733 A US 201815954733A US 10890671 B2 US10890671 B2 US 10890671B2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/208—Circuits specially adapted for scintillation detectors, e.g. for the photo-multiplier section
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/161—Applications in the field of nuclear medicine, e.g. in vivo counting
- G01T1/164—Scintigraphy
- G01T1/166—Scintigraphy involving relative movement between detector and subject
- G01T1/1663—Processing methods of scan data, e.g. involving contrast enhancement, background reduction, smoothing, motion correction, dual radio-isotope scanning, computer processing ; Ancillary equipment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/17—Circuit arrangements not adapted to a particular type of detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/2018—Scintillation-photodiode combinations
Definitions
- the present invention relates generally to a time-based signal acquisition apparatus and method using sawtooth-shaped threshold voltage, and more specifically to a time-based signal acquisition apparatus and method which are capable of precisely and economically measuring the energy and arrival time information of a radioactive ray detected from a scintillation signal generated by a radiation detector.
- the energy of the radioactive ray is obtained from the integration of the signal or the maximum height of the signal, and the detection time information thereof is computed as the time at which the signal starts to be generated. Accordingly, the energy and arrival time information of the radioactive ray can be accurately computed only if the signal generated by the radiation detector can be precisely measured.
- the type of scintillation crystal or the reaction location can be determined via the decay time of the signal. Accordingly, it is necessary to be able to accurately estimate the height, generation time and decay time of a signal in the signal of the radiation detector.
- Conventional methods for acquiring information from a scintillation signal include a method using a charge-to-digital converter (hereinafter referred to as a “QDC”) and a method using an analog-to-digital converter (hereinafter referred to as an “ADC”). These two methods are advantageous in that energy information can be most accurately acquired.
- QDC charge-to-digital converter
- ADC analog-to-digital converter
- the method using a QDC is the technology which accumulates charges, emitted from a radiation detector, in a capacitor for a predetermined period (charge integration) and then reads the accumulated charges.
- the method using a QDC is disadvantageous in that a time-to-digital converter (hereinafter referred to as a “TDC”) is additional required to acquire detection time information because the detection time information cannot be measured, and is also disadvantageous in that two charge-to-digital converters (QDCs) having different charge integration intervals are required to estimate decay time information.
- TDC time-to-digital converter
- the method using an ADC is advantageous in that energy, detection time and decay time information can be simultaneously acquired.
- the method using an ADC having a sampling rate of tens to hundreds of MHz requires a TDC because it cannot precisely compute detection time information.
- the method using an ADC having a sampling rate of several GHz can precisely measure time information, it is disadvantageous in that it is very expensive and multichannel expansion is impossible due to serious heat radiation.
- a QDC and an ADC are relatively expensive, and are unfavorable for an increase in the level of integration which enables the handling of thousands to tens of thousands of signals. Accordingly, recently, there has been proposed a time-based signal acquisition technology which acquires information by using only TDC.
- Time-over-Threshold i.e., one of the time-based signal acquisition technologies
- ToT is the simplest time-based signal acquisition method.
- ToT is a technology which measures the energy of a scintillation signal by measuring the width of a waveform above a specific threshold voltage in the scintillation signal. In this case, the detection time of the scintillation signal is acquired from the leading edge of an output signal.
- ToT is disadvantageous in that a ToT value is not proportional to but has a logarithmic relationship with actually detected energy, and is also disadvantageous in that it is sensitive to noise, thus resulting in poor energy resolution, i.e., poor energy detection performance. Furthermore, this method is disadvantageous in that it cannot estimate the decay time of a scintillation signal. Moreover, there is a tradeoff between the energy and the precision of time measurement depending on the setting of threshold voltage.
- MVT multi-voltage threshold
- dToT dynamic threshold
- QTC charge-to-time converter
- the MVT technology is a technology which can improve energy linearity by simultaneously using different types of ToT having different threshold voltages, it is disadvantage in that large numbers of comparators and digital channels are required.
- the dToT technology and the QTC technology are disadvantageous in that precise time measurement cannot be made because time information is sacrificed for the improvement of energy linearity.
- the above-described background art corresponds to technical information which has been possessed by the present inventor in order to conceive the present invention or which has been acquired in the process of conceiving the present invention, and is not necessarily considered to be a well-known technology that had been known to the public before the filing date of the present invention.
- An object of at least one embodiment of the present invention is to provide a time-based signal acquisition apparatus and method using sawtooth-shaped threshold voltage, which are intended to acquire energy and time information from a scintillation signal.
- An object of at least one embodiment of the present invention is to provide a time-based signal acquisition apparatus and method using sawtooth-shaped threshold voltage, which are capable of precisely estimating energy and time information from a scintillation signal without requiring the use of an expensive apparatus.
- An object of at least one embodiment of the present invention is to provide a time-based signal acquisition apparatus and method using sawtooth-shaped threshold voltage, which are unsusceptible to noise because information is acquired from various sampling points.
- a signal acquisition apparatus for acquiring the information of a scintillation signal
- the signal acquisition apparatus including: a sawtooth-shaped voltage generation unit configured to generate a sawtooth-shaped threshold voltage which increases when the threshold voltage is smaller than a voltage value of the scintillation signal and which decreases to an initial value when the threshold voltage is larger than the voltage value of the scintillation signal; and a signal comparison unit configured to receive the scintillation signal, to compare the voltage value of the scintillation signal with the threshold voltage, and to generate a digital pulse train.
- a signal acquisition method which is performed by a signal acquisition apparatus for acquiring the information of a scintillation signal, the signal acquisition method including: receiving a scintillation signal; generating a sawtooth-shaped threshold voltage which increases when the threshold voltage is smaller than a voltage value of the scintillation signal and which decreases to an initial value when the threshold voltage is larger than the voltage value of the scintillation signal; comparing the voltage value of the scintillation signal with the threshold voltage, and generating a digital pulse train; and computing at least one of energy information and detection time information of the scintillation signal based on the digital pulse train.
- FIG. 1 is a block diagram showing the functional configuration of a signal acquisition apparatus according to an embodiment of the present invention
- FIG. 2 is a circuit diagram of the signal acquisition apparatus according to the embodiment of the present invention.
- FIG. 3 is a graph showing the waveform of a signal obtained using the signal acquisition apparatus according to the embodiment of the present invention.
- FIG. 4 is a flowchart showing a signal acquisition method according to an embodiment of the present invention in a stepwise manner
- FIG. 5 is a graph showing the comparison between the waveform of a scintillation signal actually reconstructed using the signal acquisition apparatus according to the embodiment of the present invention and the waveform of a scintillation signal acquired via a high-performance analog-to-digital converter (ADC);
- ADC analog-to-digital converter
- FIG. 6 is a graph showing the energy linearity between the scintillation signal actually reconstructed using the signal acquisition apparatus according to the embodiment of the present invention and the scintillation signal acquired via the high-performance ADC;
- FIGS. 7 and 8 are graphs showing comparisons in performance between the signal acquisition method according to the embodiment of the present invention and conventional signal acquisition methods.
- FIG. 9 is a graph indicating that scintillation crystals having different decay times are distinguished from each other by using the signal acquisition method according to the embodiment of the present invention.
- FIG. 1 is a block diagram showing the functional configuration of a signal acquisition apparatus according to an embodiment of the present invention.
- FIG. 2 is a circuit diagram of the signal acquisition apparatus according to the embodiment of the present invention.
- FIG. 3 is a graph showing the waveform of a signal obtained using the signal acquisition apparatus according to the embodiment of the present invention.
- FIG. 4 is a flowchart showing a signal acquisition method according to an embodiment of the present invention in a stepwise manner.
- a signal acquisition apparatus 100 includes a sawtooth-shaped voltage generation unit 10 .
- the sawtooth-shaped voltage generation unit 10 generates a sawtooth-shaped threshold voltage T(t) shown in FIG. 3 .
- the sawtooth-shaped voltage generation unit 10 may generate a sawtooth-shaped threshold voltage T(t) having a value which increases from an initial threshold voltage T 0 over time and which decreases back to the initial threshold voltage T 0 when the value becomes larger than a scintillation signal S(t).
- the waveform of the sawtooth-shaped threshold voltage T(t) shown in FIG. 3 is merely an example.
- the sawtooth-shaped threshold voltage T(t) generated by the signal acquisition apparatus 100 according to the embodiment of the present invention may have a waveform having a value which rapidly increases from the initial threshold voltage T 0 and which gradually decreases over time when the value becomes larger than the scintillation signal S(t).
- the sawtooth-shaped threshold voltage T(t) generated by the signal acquisition apparatus 100 according to the embodiment of the present invention may have a sawtooth shape which gradually increases from an initial threshold voltage T 0 over time and which gradually decreases when the value of the sawtooth shape becomes larger than the scintillation signal S(t).
- the following description will be given with a focus on a method of generating the threshold voltage T(t) having a sawtooth waveform shown in FIG. 3 and then computing the energy of a scintillation signal.
- the sawtooth-shaped voltage generation unit 10 may be configured to include a low-pass filter, including a resistor R S and a capacitor C S , and an analog switch, as shown in FIG. 2 .
- the analog switch S may be controlled to enter a closed state when the output of a comparator Comp to be described later is 0, and may be controlled to enter an open state when the output of the comparator is 1.
- the signal acquisition apparatus 100 may include an inverter I configured to receive and invert the output of the comparator Comp.
- the threshold voltage T(t) has a predetermined initial threshold voltage T 0 when the analog switch S is in a closed state.
- the analog switch S is selectively connected to a power supply which outputs the predetermined initial threshold voltage T 0 .
- the threshold voltage T(t) is gradually increased by the low-pass filter when the analog switch S enters an open state.
- the initial threshold voltage T 0 may be set above the baseline of a scintillation signal, as shown in FIG. 3 .
- the signal acquisition apparatus 100 may further include a signal comparison unit 20 .
- the signal comparison unit 20 may compare the voltage values of the scintillation signal S(t) and the threshold voltage T(t), and may then output a digital pulse train having different values when the value of the scintillation signal S(t) is larger than that of the threshold voltage T(t) and when the value of the scintillation signal S(t) is smaller than that of the threshold voltage T(t).
- the signal comparison unit 20 may be configured to include the comparator Comp configured to receive a scintillation signal S(t) and a threshold voltage T(t) and then output a digital output signal D(t), as shown in FIG. 2 .
- the comparator Comp may output 1 when the scintillation signal S(t) is higher than the threshold voltage T(t), and may output when the scintillation signal S(t) is lower than the threshold voltage T(t), as shown in FIG. 3 . In response to this, the output of the digital pulse train may be generated.
- the inverter I of the sawtooth-shaped voltage generation unit 10 inverts the output D(t) of the comparator Comp and controls the analog switch S. Accordingly, when the threshold voltage T(t) having a value which is increased over time by the low-pass filter becomes higher than the scintillation signal S(t), the output of the comparator Comp becomes 0, and thus the output of the inverter I becomes 1. Therefore, when the analog switch S is switched to a closed state, and thus the threshold voltage T(t) is decreased to the initial threshold voltage T 0 .
- the sawtooth-shaped voltage generation unit 10 receives the feedback of the output of the signal comparison unit 20 , and uses the feedback to generate sawtooth-shaped voltage.
- the signal acquisition apparatus 100 may include two buffers B 1 and B 2 as circuit components in order to transfer the output D(t) of the comparator Comp to the low-pass filter or output the output D(t) of the comparator Comp to the outside.
- the signal acquisition apparatus 100 compares the sawtooth-shaped threshold voltage T(t) with the scintillation signal S(t) and outputs the digital pulse train.
- the circuit configuration of the signal acquisition apparatus 100 shown in FIG. 2 is merely an example which is used to generate the sawtooth-shaped threshold voltage T(t) by the signal acquisition apparatus 100 according to the present invention, as described above.
- the signal acquisition apparatus 100 according to the present invention is not limited to the circuit configuration shown in FIG. 2 .
- the signal acquisition apparatus 100 may further include a signal recovery unit 30 .
- the signal recovery unit 30 may recover the scintillation signal by using the output of the above-described signal comparison unit 20 , i.e., the digital pulse train.
- the voltage values of points shown in the form of red circles in FIG. 3 may be computed using the times, at which the leading edges and/or trailing edges of pulses included in the digital pulse train D(t) output through the comparison between the scintillation signal S(t) and the threshold voltage T(t) appear, and the slopes ⁇ a of the threshold voltages of the digital pulse train D(t).
- V(n) represents the voltage value of the n-th sawtooth of the sawtooth-shaped threshold voltage T(t)
- w(n) represents the time width of an n-th pulse and corresponds to a value obtained by subtracting the time t 1 (n) at which the leading edge of the n-th pulse appears from the time t t (n) at which the trailing edge of the n-th pulse appears.
- V(n) is the threshold voltage T(t) when the scintillation signal S(t) coincides with the threshold voltage T(t) as a result of the comparison of the signal comparison unit 20 .
- Computing V(n) by means of the above-described method is substantially the same as acquiring the voltage values of the scintillation signal S(t) at a plurality of sampling points (the times at which the trailing edges of a plurality of pulses included in the digital pulse train D(t) appear, i.e., t t (0), t t (1), t t (2), t t (3), etc. in FIG. 3 ).
- the signal recovery unit 30 may acquire the detection time information of the scintillation signal by using the time value t 1 (0), at which the leading edge of the first pulse of the digital pulse train D(t) appears, in order to recover the scintillation signal S(t).
- the signal recovery unit 30 may precisely recover the scintillation signal by using the detection time information and the voltage values at the respective sampling points.
- a signal emitted from a radiation detector may be represented by the combination of the following two exponential functions. Accordingly, the signal recovery unit 30 may recover the scintillation signal S(t) by means of a method of obtaining, for example, the constants of the following exponential functions by using a plurality of sampling points:
- the signal acquisition apparatus 100 may further include an information computation unit 40 configured to compute information about the energy and detection time of the scintillation signal as final detection results based on the recovered signal.
- the information computation unit 40 may output the time value t 1 (0) at which the leading edge of the first pulse appears, which is used during the recovery of the signal, as the detection time information, and may compute the energy information by integrating the recovered signal.
- the energy information and detection time information which are output by the information computation unit 40 as final results represent the energy information and arrival time information of the scintillation signal generated by the radiation detector.
- the energy of the scintillation signal S(t) may be computed by means of the following equation by using a rectangular sum method:
- the energy of the scintillation signal S(t) may be computed by means of the following equation by using a trapezoidal sum method:
- the signal acquisition apparatus 100 receives the scintillation signal S(t), generated by a radiation detector, at step S 401 .
- the signal acquisition apparatus 100 generates a sawtooth-shaped threshold voltage T(t) which has an initial value T 0 , increases, and decreases back to the initial value T 0 when the increased value becomes larger than the scintillation signal S(t).
- the initial value T 0 has a value higher than the baseline of the scintillation signal.
- the signal acquisition apparatus 100 compares the input voltage value of the scintillation signal S(t) with a threshold voltage T(t), and outputs 1 when the scintillation signal S(t) is higher than the threshold voltage T(t), and outputs 0 when the threshold voltage T(t) is higher than the scintillation signal S(t), thereby acquiring a digital pulse train D(t).
- steps S 401 to S 405 are repeatedly performed until the voltage value of the scintillation signal S(t) becomes equal to or lower than T 0 again. Accordingly, the value of the threshold voltage T(t) generated at step S 403 is substantially influenced by a comparison result obtained at step S 405 .
- the signal acquisition apparatus 100 may recover the scintillation signal S(t) by using the digital pulse train D(t) acquired through the performance of steps S 401 to S 405 .
- the signal acquisition apparatus 100 may compute threshold voltages T(t) at corresponding times by using the times, at which the trailing edges of respective pulses appear, as sampling points, as described above.
- the time values at which the trailing and leading edges of the pulses appear and the slopes “a” which the threshold voltages T(t) have may be used.
- the signal acquisition apparatus 100 may recover the scintillation signal S(t) by using the computed voltage values at the sampling points.
- the signal acquisition apparatus 100 may compute the energy information of the scintillation signal by using the recovered scintillation signal S(t).
- the energy information may be computed by integrating the recovered signal.
- the signal acquisition apparatus 100 may compute the time at which the leading edge of the first pulse of the digital pulse train D(t) appears as detection time information, i.e., the arrival time information of the scintillation signal.
- steps S 407 and S 409 may be replaced with the step of computing the energy of the scintillation signal S(t) by using the digital pulse train D(t) acquired through the performance of steps S 401 to S 405 .
- the step of directly computing energy by using the coordinates of the sampling points of the digital pulse train D(t) without recovering the scintillation signal S(t) and then integrating the recovered signal may be performed in place of steps S 407 and S 409 .
- FIG. 5 is a graph showing the comparison between the waveform of a scintillation signal actually reconstructed using the signal acquisition apparatus according to the embodiment of the present invention and the waveform of a scintillation signal acquired via a high-performance analog-to-digital converter (ADC).
- FIG. 6 is a graph showing the energy linearity between the scintillation signal actually reconstructed using the signal acquisition apparatus according to the embodiment of the present invention and the scintillation signal acquired via the high-performance ADC.
- FIGS. 7 and 8 are graphs showing comparisons in performance between the signal acquisition method according to the embodiment of the present invention and conventional signal acquisition methods
- FIG. 9 is a graph indicating that scintillation crystals having different decay times are distinguished from each other by using the signal acquisition method according to the embodiment of the present invention.
- FIGS. 7 and 8 there can be seen the comparison of energy resolution and coincidence time resolution measured for a pair annihilation gamma ray emitted from 22 Na.
- waveform sampling at 5 GHZ acquired using a method based on a high-speed ADC operating at 5 GHz exhibited the best result
- the signal acquisition method STS proposed by the present invention did not exhibit a significant difference.
- the signal acquisition method according to the present invention can be implemented at a considerably lower cost than the high-speed ADC-based method, and has a significant advantage in its scalability.
- the conventional time-based signal acquisition method i.e., ToT, has poorer energy and time resolution performance than the proposed method.
- the signal acquisition method according to the embodiment of the present invention may accurately distinguish scintillation crystals having different decay times from each other.
- the ratio of the head to the rail of a scintillation signal of a scintillation crystal L 0.95 GSO having a decay time constant of 40 ns and the ratio of the head to the rail of a scintillation signal of a scintillation crystal L 0.20 GSO having a decay time constant of 60 ns are clearly distinguished from each other.
- unit means software or a hardware component such as a field-programmable gate array (FPGA) or application-specific integrated circuit ASIC, and a “unit” performs any role.
- a “unit” is not limited to software or hardware.
- a “unit” may be configured to be present in an addressable storage medium, and also may be configured to run one or more processors. Accordingly, as an example, a “unit” includes components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments in program code, drivers, firmware, microcode, circuits, data, a database, data structures, tables, arrays, and variables.
- Components and a function provided in “unit(s)” may be coupled to a smaller number of components and “unit(s)” or divided into a larger number of components and “unit(s).”
- components and “unit(s)” may be implemented to run one or more CPUs in a device or secure multimedia card.
- a signal acquisition method may be implemented as a computer program (or a computer program product) including computer-executable instructions.
- the computer program includes programmable machine instructions which are processed by a processor, and may be implemented in a high-level programming language, an object-oriented programming language, an assembly language, a machine language, or the like.
- the computer program may be stored in a tangible computer computer-readable storage medium (for example, memory, a hard disk, a magnetic/optical medium, a solid-state drive (SSD), or the like).
- a signal acquisition method may be implemented in such a manner that the above-described computer program is executed by a computing apparatus.
- the computing apparatus may include at least some of a processor, memory, a storage device, a high-speed interface connected to memory and a high-speed expansion port, and a low-speed interface connected to a low-speed bus and a storage device. These individual components are connected using various buses, and may be mounted on a common motherboard or using another appropriate method.
- the processor may process instructions within a computing apparatus.
- An example of the instructions is instructions which are stored in memory or a storage device in order to display graphic information for providing a Graphic User Interface (GUI) onto an external input/output device, such as a display connected to a high-speed interface.
- GUI Graphic User Interface
- a plurality of processors and/or a plurality of buses may be appropriately used along with a plurality of pieces of memory.
- the processor may be implemented as a chipset composed of chips including a plurality of independent analog and/or digital processors.
- the memory stores information within the computing device.
- the memory may include a volatile memory unit or a set of the volatile memory units.
- the memory may include a non-volatile memory unit or a set of the non-volatile memory units.
- the memory may be another type of computer-readable medium, such as a magnetic or optical disk.
- the storage device may provide a large storage space to the computing device.
- the storage device may be a computer-readable medium, or may be a configuration including such a computer-readable medium.
- the storage device may also include devices within a storage area network (SAN) or other elements, and may be a floppy disk device, a hard disk device, an optical disk device, a tape device, flash memory, or a similar semiconductor memory device or array.
- SAN storage area network
- the time-based signal acquisition apparatus and method using sawtooth-shaped threshold voltage which are intended to acquire energy and time information from a scintillation signal.
- the time-based signal acquisition apparatus and method using sawtooth-shaped threshold voltage which are capable of precisely estimating energy and time information from a scintillation signal without requiring the use of an expensive apparatus.
- the time-based signal acquisition apparatus and method using sawtooth-shaped threshold voltage which are unsusceptible to noise because information is acquired from various sampling points.
Abstract
Description
V(0)=a*w(0)+T 0 ,w(0)=t t(0)−t 1(0)
V(1)=a*w(1)+T 0 ,w(1)=t t(1)−t 1(1)
V(2)=a*w(2)+T 0 ,w(2)=t t(2)−t 1(2)
V(3)=a*w(3)+T 0 ,w(3)=t t(3)−t 1(3)
V(n)=a*(w(0)−t d)+T 0 ,w(0)=t t(0)−t 1(0)
e=Σ i=1 n v (i) w (i)≈Σi=1 n(w (i))2
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4645918A (en) * | 1982-12-07 | 1987-02-24 | Hamamatsu Photonics Kabushiki Kaisha | Instruments for measuring light pulses clocked at high repetition rate and electron tube devices therefor |
JPH05152909A (en) | 1991-12-02 | 1993-06-18 | Toshiba Corp | Signal noise discriminator |
JPH09133772A (en) | 1995-08-01 | 1997-05-20 | Eev Ltd | Image forming device |
JP5531021B2 (en) | 2009-10-01 | 2014-06-25 | 株式会社島津製作所 | Pulse height analyzer and nuclear medicine diagnostic apparatus provided with the same |
US20150372689A1 (en) * | 2013-02-05 | 2015-12-24 | Raycan Technology Co., Ltd. (Su Zhou) | Threshold correction method for multi-voltage threshold sampling digitization device |
KR20160050686A (en) | 2014-10-30 | 2016-05-11 | 서강대학교산학협력단 | Signal processing system and method for medical image equipment using multi threshold voltage |
KR101687522B1 (en) | 2015-06-25 | 2016-12-20 | 주식회사 뷰웍스 | X-ray detector |
-
2017
- 2017-04-17 KR KR1020170049246A patent/KR101930402B1/en active IP Right Grant
-
2018
- 2018-04-17 US US15/954,733 patent/US10890671B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4645918A (en) * | 1982-12-07 | 1987-02-24 | Hamamatsu Photonics Kabushiki Kaisha | Instruments for measuring light pulses clocked at high repetition rate and electron tube devices therefor |
JPH05152909A (en) | 1991-12-02 | 1993-06-18 | Toshiba Corp | Signal noise discriminator |
JPH09133772A (en) | 1995-08-01 | 1997-05-20 | Eev Ltd | Image forming device |
JP5531021B2 (en) | 2009-10-01 | 2014-06-25 | 株式会社島津製作所 | Pulse height analyzer and nuclear medicine diagnostic apparatus provided with the same |
US20150372689A1 (en) * | 2013-02-05 | 2015-12-24 | Raycan Technology Co., Ltd. (Su Zhou) | Threshold correction method for multi-voltage threshold sampling digitization device |
KR20160050686A (en) | 2014-10-30 | 2016-05-11 | 서강대학교산학협력단 | Signal processing system and method for medical image equipment using multi threshold voltage |
KR101687522B1 (en) | 2015-06-25 | 2016-12-20 | 주식회사 뷰웍스 | X-ray detector |
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